Topic: Digital Logic
The logical operation of the following circuit is (Circuit with two NAND gates acting as NOT gates feeding into a third NAND gate)
- A. XOR
- B. NAND
- C. AND
- D. OR
Answer: D. OR
Explanation: The two input NAND gates have their inputs tied together, acting as NOT gates to produce $\overline{A}$ and $\overline{B}$. These are fed into the final NAND gate, resulting in $\overline{\overline{A} \cdot \overline{B}}$. By De Morgan's Law, this simplifies to $A + B$, which is the OR operation.